No abstract available
Publication types
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Adult
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Age Factors
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Aged
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Bronchitis / physiopathology*
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Chronic Disease
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Cough / physiopathology
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Female
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Humans
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Lung Diseases, Obstructive / physiopathology
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Male
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Middle Aged
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Mucous Membrane / physiopathology
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Mucus / physiology
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Respiratory Function Tests
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Smoking / physiopathology*
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Trachea / physiopathology*